Internal-combustion engine



May 18 1926.

I E. HERKT INTERNAL COMBUSTION ENGINE Filed Jan. 1925 Fig.2.

Fig. 4.

Patented May 18, 1926.

UNITED STATES PATENT OFFICE.

ERNST HERKT, F KIEL-HASSEE, GERMANY, ASSIGNOR TO FRIED. KBUPP GE RMANIA- WERFT AKTIENGESELLSCH-AFT, 0F KIEL-GAARDEN, GERMANY.

Application filed January 21, 1925. Serial No. 3,846.

This invention relates to internal combustion engines in which the cross-head or piston is provided with a lateral arm for driving a pump. It has for its object to provide an engine of the said character in which such a lateral arm has not only connected to it the. piston rod of a scavenging pump but also the telescopic pipes for supply and discharge of the cooling water for the working piston, whereby it is made possible to attain an especially advantageous (onstruction of the engine.

An embodiment of the subject-matter of the invention is illustrated in the accompanying drawing in which:

Fig. 1- is a cross-section through a multi cylinder internal combustion engine of the two-stroke type and Fig. 2 a partial side elevation of the eni gine.

A is a cylinder of a multi-cylinder twostroke internal combustion engine which is mounted on standards B B The piston G working in the cylinder A, transmits its movement by the piston rod D, to the crosshead E and from the latter by the connecting rod F to the crank G of the engine shaft. Connected to each of the working cylinders is a cylinder H of a scavenging pump. "The pump cylinder H has itsbearing faces 72. fastened to corresponding flanges a of the working cylinder and is supported from below by a distance piece J which is fastened to the standards-B and provided with an opening 2' piston rod L of which extends downwardly through the stufiing-box 71. into the interior of the distance piece J. The scavenging pump is double-acting. During the downward stroke of the piston K the air is drawn in from the atmosphere through valves M the air chambers are closed by covers Mounted -for reciprocation. in the pump cylinder H is the piston K the The piston K of" the scavenging pump is driven by an arm P iasiened to the crosshead of the engine, the piston rod it being in screw-tln-eaded conm-ction with the said arm. The arm I. has. besides, connected to it the telescopic pipes \i which serve to supply and lead oil the cooling water for the working cylinder C. These pipes extend at both sides of the pump piston rod L through the arm 1 with which they are in screw-t1]readed engagement. From the arm 1 they extend on the one hand to the working piston C and on the other hand to a housing Q, which is suspended from the distance piece J and provided with inlet and outlet pipes g for the cooling water.

By arranging the cylinder of the scavenging pump directly beside the working cylinder, it-is attained that the passage of the scavenging air from the pump into the cylinder takes place on a short way so that special air pipes which always entail losses of pressure, are dispensed with. Besides, by arranging the housings of the telescopic pipes likewise at the side of the engine, these delicate parts of the engine are rendered easily accessible. ment of the pump cylinders and housings of the telescopic pipes on a common distance piece J finally allows of these parts being carefully worked upon, accurately centered and simply assembed. The distance piece may be bolted to or cast integrally with the crank casing or the standards.

Claims.

1. In a two-stroke internal combustion engine having a cylinder and a piston therein, a scavenging pump, a reservoir for receiving the air compressed by said pump, said reservoir being fixed directly beside the engine cylinder and communicating directly with the latter by a passage controlled by the engine piston, and an arm on a rectilinearly reciprocating engine element operatively connected to the piston of said scavenging pump.

2. In a two-stroke internal combustion en gine having a cylinder and a piston therein, a scavenging pump. a jacket surrounding the cylinder of said pump and forming a reservoir for the air compressed by the The described arrange- I latter, said jacket being disposed directly trolled by the engine piston, and an arm on a rectilinearly reciprocating engine element operatively connected to the piston of said scavenging pump.

3. In a two-stroke internal combustion engine, a water cooling system including telescopic pipes, at scavenging pump having its cylinder disposed directly beside the engine cylinder and communicating therewith, a distance piece interposed between and fixed to said pump cylinder and the stationary element of said telescopic pipes for maintaining the two in operative plinement, and an arm on a rectilinearly reciprocating en gine element operatively connected to the piston of said scavenging pump and to the movable element of said telescopic pipes. 4. In combination with a two-stroke internal combustion engine comprising a cylinder and piston therein whose piston rod is connected to a crosshead provided with a crosshead slipper on one side only, a scavenging pump arranged atone side of the cylinder comprising a cylinder, piston, and piston rod, and an arm rigidly projecting from the cromhead on the side opposite the crosshead slipper, and connected to the piston rod of the scavenging pump.

5. In combination with a two-stroke in-' ternal combustion engine comprising a work cylinder and piston therein whose piston rod is connected to a crosshead provlded with a crosshead slipper on one side only, a scavenging pump, comprising a cylinder, piston,

and piston rod, arranged beside the work' cylinder with its cylinder at the same height as the. work cylinder, a chamber arranged to take the compressed air from the pump, the chamber being built'onto the work cylinder and communicating therewith through a continuously open passage, and an arm rigidly projecting from the crosshead and connected to the connecting rod of the scavenging pump.

6. In combination with a two-stroke internal combustion engine comprising a work cylinder and piston therein whose piston rod is connected to a crosshead provided with a crosshead slipper on one side only, a scavenging pump, comprising a cylinder, piston, and piston rod arranged beside the work cylinder with its cylinder at thesame height as the work cylinder, a casing surrounding the scavenging pump cylinder and forming a reservoir for the compressed air from the pump, said casing being fastened to the .work cylinder and communicating therewith through a continuously open passage, and an arm rigidly projecting from the crosshead and connected to the piston rod of the scavenging pump.

7. In combination with a two-stroke internal combustion engine comprising a cylinder and a piston therein whose piston rod is connected to a crosshead provided with a crosshead slipper on one side only, a scavenging pump comprising a cylinder, piston, and a piston rod, arranged beside the work cylinder, a water cooling system including telescoping pipes, a distance piece inserted between and rigidly connected to the scavenging pump cylinder and the stationary element of the telescoping pipes to hold them in operative alignment, and an arm rigidly projecting from the crosshead and connected to the piston rod of the scavenging pump and the movable element of the telescoping pipes.

The foregoing specification signed at Hamburg, Germany, this 11th day of December, 1924.

ERNST HERKT. 

